Stovepipe.



K. W. STEINHART.

STOVEPIPE.

APPLICATION FILED MAR. 13. I9I7.

Patented Jan. 15, 1918.

WITNESSES f/zg w ATTORNEY KURT W. STEINHART, OF TACbMA, WASHINGTON.

STOVEPIPE.

W. STEINHART, at

pipe section from a rectangular sheet of metal so that the finishedsection shall have an improved form of scam between the edges of thesheet.

This object is carried out in the manner hereinafter more fullydescribed and claimed, and as shown in the drawings wherein Figure 1 isa plan view of a stove pipe section made in accordance with myinvention, showing its bell end partly broken away and the male end ofan adjacent section inserted therein.

Fig. 2 is a perspective detail of the female end of one section, and

Fig. 3 is a perspective detail of the binder for contracting t e bellend of the section as explained below.

Fig. 4 is a perspective detail of this end of the section with the edgesof the sheet bent into position ready to be connected, but not yet quiteconnected.

Fig. 5 is a transverse section on an enlardged scale taken on the line55 of Fig.1; an

Fig. 6 is a sectional detail on the line 6-6 I of Fig. 5.

Fig. 7 is a plan view of the blank from which one of these improvedstove pipe sections is made.

In Fig. 7 of thedrawings the numeral 1 designates a blank of sheet metalfrom which one of my improved stove pipe sections is to be made. Thisblank is substantially rectangular, being of a'width to give theappropriate circumference to the finished section, and of a lengthmeasuring about twenty-two inches because that is the standard length ofstove pipe sections now on the market. Nevertheless, I do not'wish to belimited to the measurements, nor as to the material or its finish. Thisblank is to be constructed in such way that when its edges are broughttogether and connected into a section of stove pipe, one end of thelatter will be contracted slightly so as to Specification of LettersPatent.

Patented am. 15, 1918',

Application filed March 13, 1917. Serial No. 154,585.

constitute the male end and the other end will be of such size as toslip over the male end, so that in effect it is the female end or bellend of the section; and, adjacent each end 1s stamped a bead whose outerprojectlon const1tutes arib near the male end and whose innerside'constitutes a groove near the female end. These beads arerespectively numbered 2 and 3 in the drawings, and need not now be againreferred to. The

lower end of the blank 1 shown in Fig. 7

is crimped or corrugated as at 4 so that eventually it may be reduced asseen at 5 in Fig. 1. At one end of the corrugated portion, whlch will beat one edge of the blank, is out a hole or opening 6, and in the otherend is out a V-shaped slit producing a triangular key 7 which eventuallywill engage said opening 6 to hold the extremity conical as seen at 5 inFig. 1. Beyond the corresponding bead at the other end of the blank 1,the metal for the entire width of the blank is left plain .as shown, butat the corners of the blank it is cut off oblique as at 10 to produce aV-shaped notch 11 as seen in Fig. 2, and at the edges of this notch atthe end of the blank are left lips 12 which are bent outward in thefinished article as seen inFigs. 2 and 4. Coacting therewith is a binder13 best seen in Fig. 3, whose body is of substantially triangular shapewith converging lips 14 along its side edges bent inward at anglesslightly acute to the plane of its body. When now the female end ofonesection is engaged over the male end of the next section, it is quitepossible that in pushing the sections together until the rib and grooverespectively engage, this end of the section will be strained open alittle, and in order to draw it again into its proper position thebinder 13 is applied and its lips 14 engaged with the lips 12 and thenthe binder moved outward as indicated by the arrow in Fig. 1. The resultwill be that when the binder reaches its final position as hereindicated, the engaging lips will draw the bell end of one sectionclosely around the body of the next adjacent section, while the headswill hold them together.

The seam for this improved pipe section is made u of male elements alongone edge of the b ank interengaging with female again and reversely benton the line 22 to produce a flap 23, and said leaf is pierced with anumber of holes or slots 24, preferably substantially square as shown.Along the right edge of the blank are cut pairs of L-shaped slits 25producing interposed T- shiiped keys 26 each having a narrow neck 27uniting it with the body of the blank and a substantially square headwhich is alittle wider than the corresponding width. of the hole 24 sothat the side edges of the head must be bent up as seen at 28 in Fig. 4in order that the head may pass through the hole. In forming the blank,the dies may be such as will cut out the holes and the slits and erhapswill score the blank along the fold ines 20 and 22; and erhaps also thedies may be such as will end up the edges 28 of the keys 26 as alreadydescribed. Now when the pipe section is to be made,

' the blank is bent and its edges drawn toward each other as seen inFig. 4; and eventually each key is passed, through its respective holeor slot so that when the parts are flattened out as in Fig. 6 the edges28 will be expanded beyond the corres onding edges of the slot and thekey will ecome locked therein. In so fiattemng out the parts by means ofsuitable tools and machinery not necessary to describe herein the leaf21 is folded down onto the body of the blank with the edges of the keysbeneath it, and the flap 23 is folded down onto the shanks or necks 27of the keys and the leaf 21 between them. Thus is produced an extremelyfine seam between the meeting edges of the blank, and the connectingportions of this seam may not be seen from the exterior as will beobvious from an inspection of Fig. 1. The side edges of the blank cannot move on each other relatively, to either contract or expand the sizeof the section or to bring said edges out of relative alinement witheach other in any direction.

When this scam is employed in connection with the male and female endsof'the stove pipe section already described, an article is producedwhich is extremely serviceable, ready for immediate use, and withalpractical and chea to make. A special feature of utility whic 1 the flappossesses, is that it covers the raw edges 28 of the keys and the necks27 thereof and all irregularities which would otherwise project into theinterior of the pipe section, and therefore a cleaning instrument suchas a brush ma besubse- 'quently forced through said section withoutcatching .on any projections. I might say in closing that it would bepossible to use this improved seam on longer pipe sections such as thoseused for spouting or in other places where sheet metal is appropriateforthe pipe material and anabsolutely water-H ti ht seam is not required.

hat is claimed as new is 1. In a sheet-metal pipe section, a seam foruniting the edges 0 the blank, the same comprising a flap along one edgeof the blank having spaced openings rectangular in shape, andcorrespondingly spaced T- shaped keys along the other edge of the blankwhose necks are integrally connected with such blank and whose heads aretransversely longer than the width of said openings whereby they must bebent slightly to pass through the openings, for the purpose set forth.

2. The herein described seam for sheet -metal pipe sections and thelike, the same In testimony whereof I. aflix my signature.

KURT W. STEINHART.

